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Finding the Fourth Proportional to 1,286.71, 1,775.57 and 727.20

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Solution

The fourth proportional to 1,286.71, 1,775.57 and 727.20 is: 1,003.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.71 : 1,775.57 = 727.20 : x
  2. Step 2: Convert to fraction form
    1,286.71/1,775.57 = 727.20/x
  3. Step 3: Cross multiply
    1,286.71x = 1,775.57 × 727.20
  4. Step 4: Simplify right side
    1,286.71x = 1,291,190.87
  5. Step 5: Solve for x
    x = 1,291,190.87/1,286.71
  6. Step 6: Final answer
    x = 1,003.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.